[0001] This invention relates to a shaving aid strip (or composite) for a razor cartridge.
[0002] It is now well known that shaving comfort can be enhanced by affixing to a razor
cartridge a shaving aid composite, also known as a lubricating strip, which continuously
releases a shaving aid, typically a lubricant, during the shaving process. See, for
example, U.S. 4,170,821 and GB 2,024,082. The shaving aid strip generally comprises
a water-insoluble polymer matrix, typically polystyrene, and a water-soluble shaving
aid, typically polyethylene oxide, which leaches out of the strip during shaving to
enhance shave comfort.
[0003] Unfortunately, conventional shaving aid strips suffer from the disadvantage that
they release an insufficient amount of the shaving aid, particularly after the first
four or five shaves where release of the shaving aid may drop off to negligible quantities.
In addition, the amount of shaving aid that may be included in the shaving aid strip
may be limited because high levels of shaving aid are difficult to process and can
adversely affect the structural integrity of the strip. Accordingly, recent efforts
have been made to improve shaving aid strips so as to enhance and prolong release
of the shaving aid.
[0004] Such efforts have resulted in improved shaving aid strips which include the following
features: incorporation of a low molecular weight release enhancing agent, such as
polyethylene glycol, into the matrix (U.S. 5,113,585); the use of ethylene vinyl acetate
copolymer as the matrix material (U.S. 5,349,750); incorporation of a compatibilizer
material such as polyethylene oxidepolypropylene oxide copolymer (e.g. Poloxamer 182)
(U.S. 5,454,164); incorporation of a water-swellable polymer such as Salsorb 84, a
cross-linked polyacrylic (U.S. 5,626,154); coextrusion of a core comprising a water-leachable
shaving aid within a sheath of water-insoluble polymer, wherein the sheath has a plurality
of openings to facilitate release of the shaving aid (WO 96/13360, which corresponds
to U.S. Ser. No. 08/497,194); and coextrusion of adjacent shaving aid portions (U.S.
5,956,848). Also known are shaving aid strips which include an essential oil (U.S.
5,095,619) or a non-volatile cooling agent (U.S. 5,713,131), and injection molded
strips which include a plasticizer (U.S. 4,850,106).
[0005] EP-A-693 528 discloses a blend used for lubricating strips for razors comprising
15 to 75 weight percent of polyethylene oxide and 5 to 35 weight percent of polycaprolactone.
[0006] The present invention is directed to a solid polymeric shaving aid strip for a razor
cartridge. The shaving aid strip comprises a lubricious water- soluble polymer and
a polycaprolactone. The strip also contains a water-insoluble polymer, which serves
as a matrix in which the water- soluble polymer is incorporated (or dispersed). It
has been found that polycaprolactone improves the fabrication of the shaving aid strip,
provides smoother strip surfaces and permits the inclusion of greater amounts of water-soluble
polymer in the strip. It has also been found that a shaving aid strip which contains
polycaprolactone releases more shaving aid during use and has better structural integrity
and less swelling. The present invention is also directed to a razor cartridge which
includes the aforementioned shaving aid strip.
[0007] The razor cartridge will comprise a blade (one or more) and a skin-engaging portion
in proximity to the blade, wherein the skin engaging portion includes the shaving
aid strip. The shaving aid strip contacts the skin during shaving and releases shaving
aid onto the skin. The shaving aid strip is typically located at the rear (or cap)
portion of the cartridge (i.e. behind the blade or blades), but may also be located
at the front (or guard) portion of the cartridge (i.e. in front of the blade or blades),
or a shaving aid strip may be placed at both positions on the cartridge. The razor
cartridge is generally affixed to a handle for use in shaving. The razor cartridge
may be designed to be removably affixed to a handle in the case of razor systems in
which the handle is reused and the cartridge is disposed of after one or more uses.
Or the razor cartridge may be permanently affixed to a handle (or integral with the
handle) in the case of disposable razors in which the handle and cartridge are disposed
of together as a unit after one or more uses. The term razor cartridge is thus intended
to apply to both types of cartridge.
Fig. 1 is a perspective view of a razor cartridge which includes a shaving aid strip
of the present invention.
Fig. 2 is a sectional view taken along line 2-2 of Fig. 1.
Fig. 3 is a perspective view of the shaving aid strip included in the razor cartridge
depicted in Fig. 1.
Fig. 4 is a side elevation view of the shaving aid strip of Fig. 3.
Fig. 5 is a side elevation view of second type of shaving aid strip of the present
invention.
Fig. 6 is a side elevation view of third type of shaving aid strip of the present
invention.
Fig. 7 is a side elevation view of fourth type of shaving aid strip of the present
invention.
[0008] Referring to Figs. 1 and 2, the razor cartridge 14 includes housing 16, which carries
three blades 18, a finned elastomeric guard 20, and a solid polymeric shaving aid
strip 22 located on a skin-engaging portion (in this case the cap) of the cartridge.
The shaving aid strip (or composite) is locked in an opening in the rear of the cartridge
and includes a lubricious water-soluble polymer shaving aid that is released by the
strip during shaving to improve shave attributes. While shown at the rear portion
of this particular razor cartridge, the shaving aid strip may be located at any skin-engaging
portion of the cartridge and may be fabricated in any size or shape deemed appropriate.
For example, the strip can be incorporated into razor cartridges such as the Mach
3®, Sensor Excel®, Atra Plus® and Custom Plus® razors sold by The Gillette Company,
as well as in other commercial razor cartridges.
[0009] Referring to Figs. 3 and 4, shaving aid strip 22 includes three exposed lengthwise-extending
portions 24, 26, and 28, each in the shape of a rounded lobe with a lengthwise-extending
exposed surface. Strip 22 also includes connecting portion 30, which connects portions
24 and 28 and also optionally serves to lock the strip into a mating receiving portion
of the cartridge. Portions 24 and 28 and connecting portion 30 preferably have the
same composition and, together, surround all but the exposed face of portion 26 and
provide support for portion 26. Portion 26 also optionally extends above portions
24 and 28 and, preferably,
comprises a greater amount (in percent by weight) of shaving aid than in portions
24 and 28. The shaving aid strip typically may be about 2.5 cm to about 3.7 cm in
length, and about 0.15 cm to about 0.35 cm in width.
[0010] Figs. 5, 6 and 7 depict alternative types of shaving aid strips. Strip 32, shown
in Fig. 5, is similar to strip 22, except that strip 32 has a homogeneous composition
throughout and a uniform, slightly curved to flat upper surface. Strip 42, shown in
Fig. 6, is also similar to strip 22, except that strip 42 has only two lengthwise
extending portions 44 and 48, each in the shape of a rounded lobe. The portion 48
preferably is larger than portion 44 and extends above portion 44, and also preferably
comprises a greater amount (in percent by weight) of shaving aid than portion 44.
Strip 52, shown in Fig. 7, has a rectangular cross-section and a homogeneous composition
throughout. Such a strip may be glued or ultrasonically welded to a razor cartridge.
This type of strip may also be fabricated in a wedgeshaped cross-section (not shown)
or any other desired shape. Shaving aid strips may also be constructed in two or more
layers, such as a sandwich or a sheath/core construction (see, for example, WO 96/01172
and WO 96/13360).
[0011] The shaving aid strip, or at least one portion thereof, will include a lubricious
water-soluble polymer and a polycaprolactone. The strip will also include a water-insoluble
polymer to serve as a matrix in which the water-soluble polymer is dispersed.
[0012] Sufficient water-soluble polymer should be included in the shaving aid strip to provide
the desired lubrication benefit. The strip, or a portion thereof, contains about 50%
to about 95%, more preferably about 55% to about 90%, most preferably about 60% to
about 85% by weight of a lubricious water-soluble polymer.
[0013] Typical lubricious water-soluble polymers include polyethylene oxide, polyvinyl pyrrolidone,
polyacrylamide, modified hydroxyalkyl cellulose, polyvinyl imidazoline, polyvinyl
alcohol, polysulfone, and polyhydroxyethylmethacrylate. The preferred lubricious water-soluble
polymer is polyethylene oxide. The more preferred polyethylene oxides generally are
known as POLYOX (available from Union Carbide Corporation) or ALKOX (available from
Meisei Chemical Works, Kyoto, Japan). These polyethylene oxides will preferably have
molecular weights of about 100,000 to 8 million daltons, most preferably about 300,000
to 5 million daltons. It is preferred to use a blend of polyethylene oxides, typically
a blend having at least one polyethylene oxide having a molecular weight in the range
of 100,000 to 500,000 and at least one polyethylene oxide having a molecular weight
in the range of 3 million to 8 million. The most preferred polyethylene oxide comprises
a blend of about 40% to 80% by weight of polyethylene oxide having an average molecular
weight of about 5 million (e.g. POLYOX COAGULANT) and about 60% to 20% of polyethylene
oxide having an average molecular weight of about 300,000 (e.g. POLYOX WSR-N-750).
A 60:40 blend of these two
polyethylene oxides (5 million:300,000) is especially preferred.
[0014] Sufficient polycaprolactone should be included in the shaving aid strip to provide
the desired benefit, which may include one of more of the following improvements over
conventional strips: improved fabrication, smoother strip surface, greater water-soluble
polymer content, improved shaving aid release, better structural integrity and less
swelling. The strip, or a portion thereof, may preferably contain, for example, about
0.5% to about 50%, more preferably about 1% to about 20%, most preferably about 1%
to about 10% by weight of a polycaprolactone.
[0015] Polycaprolactones are available from Union Carbide Corporation under the name TONE®
polymers (e.g., P-737, P-767, P-787 and Polyol 1270). These polycaprolactones include
homopolymers of ε-caprolactone, which have the structure H-[-O-(CH
2)
5-C(O)-]
n-OH, and diol or triol modified polycaprolactones, which have the structure H-[-O-(CH
2)
5-C(O)-]
m-O-R-O-[-C(O)-(CH
2)
5-O-]
n-H in which R is an aliphatic hydrocarbon, preferably derived from a lower alkyl diol
such as 1,4-butanediol, and m and n are integers. Preferably, the polycaprolactone
will have a molecular weight (number average) between about 1000 and about 80,000
daltons, more preferably between about 30,000 and 60,000 daltons, and most preferably
about 50,000 daltons. The polycaprolactone homopolymers are preferred.
[0016] The shaving aid strip, or a portion thereof, will also include a water-insoluble
polymer to serve as a matrix in which the water-soluble polymer is dispersed. The
strip or any portion will include 5% to 40%, and most preferably about 15% to about
35% by weight of the water-insoluble polymer. Suitable water-insoluble polymers which
can be used include polyethylene, polypropylene, polystyrene, butadiene-styrene copolymer
(e.g. medium and high impact polystyrene), polyacetal, acrylonitrile-butadiene-styrene
copolymer, ethylene vinyl acetate copolymer, polyurethane, and blends thereof such
as polypropylene/ polystyrene blend or polystyrene/impact polystyrene blend.
[0017] The more preferred water-insoluble polymer is polystyrene, preferably a general purpose
polystyrene, such as NOVA C2345A, or a high impact polystyrene (i.e. polystyrene-butadiene),
such as BASF 495F KG21. The strip or any portion should contain a sufficient quantity
of water-insoluble polymer to provide adequate mechanical strength, both during production
and use.
[0018] Thus, shaving aid strips of the present invention will typically include 55% to 90%,
lubricious water-soluble polymer (polyethylene oxide), 0.5% to 50%, preferably 1%
to 20%, polycaprolactone (preferably molecular weight of 30,000 to 60,000 daltons),
and 0% to 50%, preferably 5% to 40%, water-insoluble polymer (preferably polystyrene
or impact polystyrene).
[0019] The shaving aid strip, or any portion, also may contain other conventional shaving
aid ingredients, such as low molecular weight water-soluble release enhancing agents
such as polyethylene glycol (MW<10,000, e.g., 1-10% by weight PEG-100), water-swellable
release enhancing agents such as cross-linked polyacrylics (e.g., 2-7% by weight),
colorants, antioxidants, preservatives, vitamin E, aloe, cooling agents, essential
oils, beard softeners, astringents, medicinal agents, etc. Portions that contain a
colorant can be designed to release the colorant (e.g., by leaching or abrasion),
and thereby cause the strip to change color during shaving, preferably in response
to wear of the colored portion, so as to provide an indication to the user that the
shaving aid strip and/or the razor cartridge has reached the end of its effective
life or the end of its optimum performance. A portion may contain, for example, between
about 0.1% and about 5.0% (preferably between about 0.5% and 3%) colorant by weight.
[0020] Shaving aid strips of the present invention may be fabricated by any appropriate
method, including injection molding and extrusion, the latter being preferred. All
of the components of the strip are blended prior to molding or extrusion. For best
results, it is preferred that the components are dry.
[0021] The blended components may be extruded through a Haake System 90, 3/4 inch diameter
extruder with a barrel pressure of about 1000-2000 psi, a rotor speed of about 10
to 50 rpm, and a temperature of about 150°-185°C and a die temperature of about 170°-185°C.
Alternatively, a 1 1/4 inch single screw extruder may be employed with a processing
temperature of 175°-200°C, preferably 185°-190°C, a screw speed of 20 to 50 rpm, preferably
25 to 35 rpm, and an extrusion pressure of 1800 to 5000 psi, preferably 2000 to 3500
psi. The extruded strip is air cooled to about 25°C. To injection mold the strips
it is preferred to first extrude the powder blend into pellets. This can be done on
a 1 1/4 or 1 1/2 inch single screw extruder at a temperature of 120°-180°C, preferably
140°-150°C, with a screw speed of 20 to 100 rpm, preferably 45 to 70 rpm. The pellets
are then molded in either a single material molding or multi-material molding machine,
which may be single cavity or mufti-cavity, optionally equipped with a hotrunner system.
The process temperature can be from 165° to 250°C, preferably from 180° to 225°C.
The injection pressure should be sufficient to fill the part completely without flashing.
Depending on the cavity size, configuration and quantity, the injection pressure can
range from 300 to 2500 psi. The cycle time is dependent on the same parameters and
can range from 3 to 30 seconds, with the optimum generally being about 6 to 15 seconds.
[0022] The invention may be further described by the following examples in which all parts
and percentages are by weight.
EXAMPLES 1 TO 5
[0023] Shaving aid strips with a cross-section like that of strip 32 shown in Fig. 5 are
fabricated from the blends of components indicated below by extruding the blends through
a Haake System 90, 3/4 inch diameter extruder with a barrel pressure of about 1000-2000
psi, a rotor speed of about 10 to 50 rpm, and a temperature of about 150°-185°C and
a die temperature of about 170°-185°C. The extruded strips are cooled and sliced to
appropriate lengths for securing into razor cartridges like cartridge 14. Four different
polycaprolactones are alternatively used in each example.
Component |
Weight Percent |
|
Ex. 1 |
Ex. 2 |
Ex. 3 |
Ex. 4 |
Ex. 5 |
Polyethylene oxide1 |
60.0 |
60.0 |
63.0 |
75.0 |
58.5 |
Polystyrene2 |
|
|
|
|
10.5 |
High Impact Polystyrene3 |
31.5 |
28.5 |
20.5 |
|
19.5 |
PEG-100 |
5.0 |
5.0 |
5.0 |
|
5.0 |
Color4/Preserv. |
1.5 |
1.5 |
1.5 |
1.0 |
1.5 |
Polycarprolactone5 |
2.0 |
5.0 |
10.0 |
25.0 |
5.0 |
1 60:40 blend of Coagulant:WSR-N-750 (mol. wt. 5 million:300,000) |
2 Nova C2345A |
3 BASF 495F KG21 |
4 Color concentrate contains 65-95% polystyrene |
5 Tone® P-767, P-737, polyol 1270, or P-787 (Union Carbide) |
EXAMPLES 6 and 7
[0024] Shaving aid strips with a cross-section like that of strip 22 shown in Fig. 4 are
fabricated from the blends of components indicated below (four different polycaprolactones
are alternatively used in each example) by coextruding the blends in the following
manner. The components for each portion (portion 26 and portion 24, 28, 30) may be
supplied by two separate melting/pumping (plastics extruders), each consisting of
a heated barrel, a pumping screw, a motor drive for that screw and a control system
for the entire system. The materials are fed in powder form into their respective
extruders (e.g., single screw type manufactured by Davis Standard). The extruders
can operate at the same or different speeds and the same or different temperatures.
The barrel temperature for each extruder can be ramped in three zones from 165°C to
190°C; a fourth heater at the die/barrel connection can also be set to 190°C, and
a fifth heater at the die can range from 190°C to 205°C. Via rugged weldments the
molten streams of the components are brought together to form the strip. Portion 26
can be precisely located on a portion (combination of 24, 28, and 30) through accurately
machined pathways in the die head. Because they have different compositions, the two
molten materials are brought together at the last possible moment before exiting the
die. Both materials exit the die head in a size and shape approximating that of the
final product. The final dimensions are achieved using a series of forming rollers
as the extrudate is cooled. The strip is typically extruded at a rate of about 50
feet per minute. The combined molten materials are drawn from the die head into the
sizing/cooling device at a constant speed such that its cross section is always constant.
Under a bath of cool dry air the molten material is cooled until no longer pliable.
Once cooled, the strips can be cut to the appropriate length and attached to razor
cartridges like cartridge 14.
Component |
Weight Percent |
|
Example 6 |
Example 7 |
|
Portion 24,28,30 |
Portion 26 |
Portion 24,28,30 |
Portion 26 |
Polyethylene oxide1 |
62.0 |
68.0 |
60.0 |
71.0 |
H.I. Polystyrene2 |
31.5 |
17.0 |
28.5 |
11.0 |
PEG-100 |
5.0 |
5.0 |
5.0 |
5.0 |
White Color3/Preserv. |
1.5 |
|
1.5 |
|
Blue Color3/Preserv. |
|
4.0 |
|
4.0 |
Vitamin E/aloe |
|
1.0 |
|
1.0 |
Polycarprolactone4 |
|
5.0 |
5.0 |
8.0 |
1 60:40 blend of Coagulant:WSR-N-750 (mol. wt. 5 million:300,000) |
2 BASF 495F KG21 |
3 Color concentrate contains 65-95% polystyrene |
4 Tone® P-767, P-737, polyol 1270, or P-787 (Union Carbide) |
EXAMPLES 8 and 9
[0025] Shaving aid strips with a cross-section like that of strip 42 shown in Fig. 5 are
fabricated from the blends of components indicated below (four different polycaprolactones
are alternatively used in each example) by coextruding the blends in the same manner
as described in Examples 6 and 7. The components for each portion (portion 44 and
portion 48) are set out below. After fabrication, the strips can be cut to the appropriate
length and attached to razor cartridges like cartridge 14.
Component |
Weight Percent |
|
Example 8 |
Example 9 |
|
Portion 44 |
Portion 48 |
Portion 44 |
Portion 48 |
Polyethylene oxide1 |
60.0 |
75.0 |
55.0 |
69.0 |
Polystyrene2 |
|
10.2 |
|
13.2 |
H.I. Polystyrene3 |
32.5 |
|
30.5 |
|
PEG-100 |
5.0 |
5.0 |
10.0 |
5.0 |
White Color4/Preserv. |
1.5 |
|
1.5 |
|
Blue Color4/Preserv. |
|
4.0 |
|
4.0 |
Vitamin E/aloe |
|
0.8 |
|
0.8 |
Polycarprolactone5 |
1.0 |
5.0 |
3.0 |
8.0 |
1 60:40 blend of Coagulant:WSR-N-750 (mol. wt. 5 million:300,000) |
2 NOVA C2345A |
3 BASF 495F KG21 |
4 Color concentrate contains 65-95% polystyrene |
5 Tone® P-767, P-737, polyol 1270, or P-787 (Union Carbide) |
[0026] While particular embodiments of the invention have been shown and described for illustrative
purposes, it will be apparent to those skilled in the art that various changes and
modifications may be made without departing from the scope of the invention, which
is defined by the claims which follow.
1. A razor cartridge comprising a blade and a skin-engaging portion in proximity to said
blade, said skin-engaging portion including a solid polymeric shaving aid strip comprising
55% to 90% polyethylene oxide with a molecular weight of 100,000 to 8 million daltons,
5% to 40% water-insoluble polymer selected from polystyrene, butadiene-styrene copolymer
or blends thereof, and 0.5% to 50% of a polycaprolactone.
2. The razor cartridge of claim I wherein said shaving aid strip comprises 1% to 20%
polycaprolactone.
3. The razor cartridge of claim 2 wherein said shaving aid strip comprises 1% to 10%
polycaprolactone.
4. The razor cartridge of claim 1, 2 or 3 wherein said polycaprolactone has a molecular
weight between about 1000 and about 80,000 daltons.
5. The razor cartridge of claim 1, 2 or 3 wherein said polycaprolactone has a molecular
weight between about 30,000 and about 60,000 daltons.
6. The razor cartridge of claim 5 wherein said polycaprolactone is polycaprolactone homopolymer.
7. The razor cartridge of claim 2 wherein said polyethylene oxide comprises a blend of
at least one polyethylene oxide having a molecular weight in the range of 100,000
to 500,000 daltons and at least one polyethylene oxide having a molecular weight in
the range of 3 million to 8 million daltons.
8. The razor cartridge of claim 1 or 7 wherein said shaving aid strip has a homogeneous
composition throughout.
9. The razor cartridge of claim 1 or 7 wherein said shaving aid strip comprises two or
three adjacent lengthwise-extending portions and one of said portions comprises more
of said polyethylene oxide than the other of said portions.
1. Rasierklingeneinheit, aufweisend eine Klinge und einen auf die Haut aufsetzenden Abschnitt
in der Nähe der Klinge, wobei der auf die Haut aufsetzende Abschnitt einen festen,
polymeren Rasierhilfsstreifen einschließt, aufweisend 55% bis 90% Polyethylenoxid
mit einer relativen Molekülmasse von 100.000 bis 8.000.000 Dalton, 5% bis 40% wasserunlösliches
Polymer, ausgewählt aus Polystyrol, Butadien/Styrol-Copolymer oder Blends davon, sowie
0,5% bis 50% Polycaprolacton.
2. Rasierklingeneinheit nach Anspruch 1, worin der Rasierhilfsstreifen 1 % bis 20% Polycaprolacton
aufweist.
3. Rasierklingeneinheit nach Anspruch 2, worin der Rasierhilfsstreifen 1% bis 10% Polycaprolacton
aufweist.
4. Rasierklingeneinheit nach Anspruch 1, 2 oder 3, worin das Polycaprolacton eine relative
Molekülmasse von zwischen 1.000 und 80.000 Dalton hat.
5. Rasierklingeneinheit nach Anspruch 1, 2 oder 3, worin das Polycaprolactoneinerelative
Molekülmasse von zwischen 30.000 und 60.000 Dalton hat.
6. Rasierklingeneinheit nach Anspruch 5, worin das Polycaprolacton ein Polycaprolacton-Homopolymer
ist.
7. Rasierklingeneinheit nach Anspruch 2, worin das Polyethylenoxid ein Blend von mindestens
einem Polyethylenoxid mit einer relativen Molekülmasse im Bereich von 100.000 bis
500.000 Dalton aufweist und mindestens ein Polyethylenoxid mit einer relativen Molekülmasse
im Bereich von 3.000.000 bis 8.000.000 Dalton.
8. Rasierklingeneinheit nach Anspruch 1 oder 7, worin der Rasierhilfsstreifen eine durchgehend
homogene Zusammensetzung hat.
9. Rasierklingeneinheit nach Anspruch 1 oder 7, worin der Rasierhilfsstreifen zwei oder
drei angrenzende, sich längs erstreckenden Abschnitte aufweist und einer von diesen
Abschnitten mehr von dem Polyethylenoxid aufweist als der andere der Abschnitte.
1. Cartouche de rasoir comprenant une lame et une partie en contact avec la peau située
à proximité de ladite lame, ladite partie en contact avec la peau comprenant une barrette
d'aide au rasage polmyérique solide comprenant 55% à 90% de polyéthylène oxyde avec
un poids moléculaire de 100 000 à 8 millions de daltons, 5% à 40% de polymères hydro-insolubles
sélectionnés parmi un polystyrène, un copolymère butadiène-styrène, ou des mélanges
de ces derniers, et 0,5% à 50% d'un polycaprolactone.
2. Cartouche de rasoir selon la revendication 1, dans laquelle ladite barrette d'aide
au rasage comprend 1% à 20% de polycaprolactone.
3. Cartouche de rasoir selon la revendication 2, dans laquelle ladite barrette d'aide
au rasage comprend 1% à 10% de polycaprolactone.
4. Cartouche de rasoir selon la revendication 1, 2 ou 3, dans laquelle ledit polycaprolactone
a un poids moléculaire variant entre environ 1000 et environ 80 000 daltons.
5. Cartouche de rasoir selon la revendication 1, 2 ou 3, dans laquelle ledit polycaprolactone
a un poids moléculaire variant entre environ 30 000 et environ 60 000 daltons.
6. Cartouche de rasoir selon la revendication 5, dans laquelle ledit polycaprolactone
est un homopolymère de polycaprolactone.
7. Cartouche de rasoir selon la revendication 2, dans laquelle ledit polyéthylène oxyde
comprend un mélange d'au moins un polyéthylène oxyde ayant un poids moléculaire variant
entre 100 000 et 500 000 daltons et au moins un polyéthylène oxyde ayant un poids
moléculaire variant entre 3 millions et 8 millions de daltons.
8. Cartouche de rasoir selon la revendication 1 ou 7, dans laquelle ladite barrette d'aide
au rasage présente dans son ensemble une composition homogène.
9. Cartouche de rasoir selon la revendication 1 ou 7, dans laquelle ladite barrette d'aide
au rasage comprend deux ou trois parties adjacentes s'étirant dans le sens de la longueur
et une desdites parties comprend plus dudit polyéthylène oxyde que l'autre desdites
parties.